Tết is the Vietnamese New Year and most important celebration, celebrating the arrival of spring based on the lunar calendar. Popular foods include bánh chưng (steamed glutinous rice cake) and xôi gấc (sticky red rice), considered lucky due to its bright color. Families clean houses before Tết to remove bad spirits, decorate with flowers/trees, and honor ancestors by visiting graves and offerings. New clothes are worn and elders give money to children on the first day, while visiting friends on the second day is common. Greetings typically wish for good health, happiness, prosperity and longevity.